From: Robert Klemme <shortcutter@...>
Date: 2013-05-26T03:37:36+09:00
Subject: Re: Slow reading output from Open3.popen3??

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On Thu, May 23, 2013 at 4:24 AM, Thomas Luedeke <lists@ruby-forum.com>wrote:

> Thanks, guys.  I found a workaround (i.e. redirect), but I think I'll
> play around to see if the suggestions give me what I want.  It is true,
> the amount of data I'm reading may be quite large, which would cause the
> problem.
>

The problem you will be facing most probably is a deadlock.  Your "make" or
any process started by it may write to stdout and to stderr and the process
will be put to sleep if the buffer of stderr fills up (from which you do
not read) as Jeremy explained already.  That will also block any other
activity of the process unless they use infinite buffering internally and
asynchronous output (which there is no reason to do so it's unlikely).

Cheers

robert


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Thu, May 23, 2013 at 4:24 AM, Thomas Luedeke <span dir=3D"ltr">&=
lt;<a href=3D"mailto:lists@ruby-forum.com" target=3D"_blank">lists@ruby-for=
um.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Thanks, guys. =A0I found a workaround (i.e. =
redirect), but I think I&#39;ll<br>
play around to see if the suggestions give me what I want. =A0It is true,<b=
r>
the amount of data I&#39;m reading may be quite large, which would cause th=
e<br>
problem.<br></blockquote><div><br></div><div style>The problem you will be =
facing most probably is a deadlock. =A0Your &quot;make&quot; or any process=
 started by it may write to stdout and to stderr and the process will be pu=
t to sleep if the buffer of stderr fills up (from which you do not read) as=
 Jeremy explained already. =A0That will also block any other activity of th=
e process unless they use infinite buffering internally and asynchronous ou=
tput (which there is no reason to do so it&#39;s unlikely).</div>
<div style><br></div><div style>Cheers</div><div style><br></div><div style=
>robert</div></div><br clear=3D"all"><div><br></div>-- <br>remember.guy do =
|as, often| as.you_can - without end<br><a href=3D"http://blog.rubybestprac=
tices.com/">http://blog.rubybestpractices.com/</a>
</div></div>

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